Eternity (aged 10) lives in a haunted gatehouse at the edge of an ancient forest. She likes to dig for buried treasure in the woods, but one day she digs up something she shouldn't and the forest want it back.

A group of young urban explorers and a private military unit could become the final pieces in a 60-year plan to reopen a door that should have stayed closed. But what they unleashed could almost tear our world apart.